XFree86 also supports Slow Keys, Repeat Keys, Bounce Keys and an audible bell. xkbcomp can be used to generate a .xkm file to enable these. The appropriate xkbcomp commands are listed in /usr/X11R6/lib/X11/xkb/compat/accessx. Unfortunately, the exact process is still undocumented.
here is the url for the file with the above statement near the bottom:
http://www.linuxdoc.org/HOWTO/Keyboard-and-Console-HOWTO-15.html
Any help will be greatly appreciated. bob